12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 21da177e4SLinus Torvalds /* dir.c: AFS filesystem directory handling 31da177e4SLinus Torvalds * 4f3ddee8dSDavid Howells * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved. 51da177e4SLinus Torvalds * Written by David Howells (dhowells@redhat.com) 61da177e4SLinus Torvalds */ 71da177e4SLinus Torvalds 81da177e4SLinus Torvalds #include <linux/kernel.h> 91da177e4SLinus Torvalds #include <linux/fs.h> 1034286d66SNick Piggin #include <linux/namei.h> 111da177e4SLinus Torvalds #include <linux/pagemap.h> 12f3ddee8dSDavid Howells #include <linux/swap.h> 1300d3b7a4SDavid Howells #include <linux/ctype.h> 14e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 15f3ddee8dSDavid Howells #include <linux/task_io_accounting_ops.h> 161da177e4SLinus Torvalds #include "internal.h" 17a58823acSDavid Howells #include "afs_fs.h" 184ea219a8SDavid Howells #include "xdr_fs.h" 191da177e4SLinus Torvalds 20260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 2100cd8dd3SAl Viro unsigned int flags); 221da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file); 231bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx); 240b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); 25fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry); 2679ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode); 275cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, 285cf9dd55SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 29ac7576f4SMiklos Szeredi static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, 30afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 314acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 32ebfc3b49SAl Viro bool excl); 3318bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); 34260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 35260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 36260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 37260a9803SDavid Howells struct dentry *dentry); 38260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 39260a9803SDavid Howells const char *content); 40260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 411cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 421cd66c93SMiklos Szeredi unsigned int flags); 43f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); 44f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 45f3ddee8dSDavid Howells unsigned int length); 46f3ddee8dSDavid Howells 47f3ddee8dSDavid Howells static int afs_dir_set_page_dirty(struct page *page) 48f3ddee8dSDavid Howells { 49f3ddee8dSDavid Howells BUG(); /* This should never happen. */ 50f3ddee8dSDavid Howells } 511da177e4SLinus Torvalds 524b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 531da177e4SLinus Torvalds .open = afs_dir_open, 5400d3b7a4SDavid Howells .release = afs_release, 5529884effSAl Viro .iterate_shared = afs_readdir, 56e8d6c554SDavid Howells .lock = afs_lock, 573222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 581da177e4SLinus Torvalds }; 591da177e4SLinus Torvalds 60754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 61260a9803SDavid Howells .create = afs_create, 62260a9803SDavid Howells .lookup = afs_lookup, 63260a9803SDavid Howells .link = afs_link, 64260a9803SDavid Howells .unlink = afs_unlink, 65260a9803SDavid Howells .symlink = afs_symlink, 66260a9803SDavid Howells .mkdir = afs_mkdir, 67260a9803SDavid Howells .rmdir = afs_rmdir, 682773bf00SMiklos Szeredi .rename = afs_rename, 6900d3b7a4SDavid Howells .permission = afs_permission, 70416351f2SDavid Howells .getattr = afs_getattr, 7131143d5dSDavid Howells .setattr = afs_setattr, 72d3e3b7eaSDavid Howells .listxattr = afs_listxattr, 731da177e4SLinus Torvalds }; 741da177e4SLinus Torvalds 75f3ddee8dSDavid Howells const struct address_space_operations afs_dir_aops = { 76f3ddee8dSDavid Howells .set_page_dirty = afs_dir_set_page_dirty, 77f3ddee8dSDavid Howells .releasepage = afs_dir_releasepage, 78f3ddee8dSDavid Howells .invalidatepage = afs_dir_invalidatepage, 79f3ddee8dSDavid Howells }; 80f3ddee8dSDavid Howells 81d61dcce2SAl Viro const struct dentry_operations afs_fs_dentry_operations = { 821da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 831da177e4SLinus Torvalds .d_delete = afs_d_delete, 84260a9803SDavid Howells .d_release = afs_d_release, 85d18610b0SDavid Howells .d_automount = afs_d_automount, 8679ddbfa5SDavid Howells .d_iput = afs_d_iput, 871da177e4SLinus Torvalds }; 881da177e4SLinus Torvalds 895cf9dd55SDavid Howells struct afs_lookup_one_cookie { 905cf9dd55SDavid Howells struct dir_context ctx; 915cf9dd55SDavid Howells struct qstr name; 925cf9dd55SDavid Howells bool found; 935cf9dd55SDavid Howells struct afs_fid fid; 945cf9dd55SDavid Howells }; 955cf9dd55SDavid Howells 96260a9803SDavid Howells struct afs_lookup_cookie { 971bbae9f8SAl Viro struct dir_context ctx; 981bbae9f8SAl Viro struct qstr name; 995cf9dd55SDavid Howells bool found; 1005cf9dd55SDavid Howells bool one_only; 1015cf9dd55SDavid Howells unsigned short nr_fids; 10239db9815SDavid Howells struct inode **inodes; 10387182759SDavid Howells struct afs_status_cb *statuses; 1045cf9dd55SDavid Howells struct afs_fid fids[50]; 1051da177e4SLinus Torvalds }; 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds /* 1081da177e4SLinus Torvalds * check that a directory page is valid 1091da177e4SLinus Torvalds */ 110f3ddee8dSDavid Howells static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, 111f3ddee8dSDavid Howells loff_t i_size) 1121da177e4SLinus Torvalds { 11300317636SDavid Howells struct afs_xdr_dir_page *dbuf; 114f3ddee8dSDavid Howells loff_t latter, off; 1151da177e4SLinus Torvalds int tmp, qty; 1161da177e4SLinus Torvalds 117dab17c1aSDavid Howells /* Determine how many magic numbers there should be in this page, but 118dab17c1aSDavid Howells * we must take care because the directory may change size under us. 119dab17c1aSDavid Howells */ 120dab17c1aSDavid Howells off = page_offset(page); 121dab17c1aSDavid Howells if (i_size <= off) 122dab17c1aSDavid Howells goto checked; 123dab17c1aSDavid Howells 124dab17c1aSDavid Howells latter = i_size - off; 1251da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1261da177e4SLinus Torvalds qty = PAGE_SIZE; 1271da177e4SLinus Torvalds else 1281da177e4SLinus Torvalds qty = latter; 12900317636SDavid Howells qty /= sizeof(union afs_xdr_dir_block); 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds /* check them */ 13263a4681fSDavid Howells dbuf = kmap(page); 1331da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 13400317636SDavid Howells if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) { 135dab17c1aSDavid Howells printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", 136f3ddee8dSDavid Howells __func__, dvnode->vfs_inode.i_ino, tmp, qty, 13700317636SDavid Howells ntohs(dbuf->blocks[tmp].hdr.magic)); 138f3ddee8dSDavid Howells trace_afs_dir_check_failed(dvnode, off, i_size); 13963a4681fSDavid Howells kunmap(page); 140f51375cdSDavid Howells trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); 1411da177e4SLinus Torvalds goto error; 1421da177e4SLinus Torvalds } 14363a4681fSDavid Howells 14463a4681fSDavid Howells /* Make sure each block is NUL terminated so we can reasonably 14563a4681fSDavid Howells * use string functions on it. The filenames in the page 14663a4681fSDavid Howells * *should* be NUL-terminated anyway. 14763a4681fSDavid Howells */ 14863a4681fSDavid Howells ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0; 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds 15163a4681fSDavid Howells kunmap(page); 15263a4681fSDavid Howells 153dab17c1aSDavid Howells checked: 154f3ddee8dSDavid Howells afs_stat_v(dvnode, n_read_dir); 155be5b82dbSAl Viro return true; 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds error: 158be5b82dbSAl Viro return false; 159ec26815aSDavid Howells } 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds /* 162445b1028SDavid Howells * Check the contents of a directory that we've just read. 163445b1028SDavid Howells */ 164445b1028SDavid Howells static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req) 165445b1028SDavid Howells { 166445b1028SDavid Howells struct afs_xdr_dir_page *dbuf; 167445b1028SDavid Howells unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block); 168445b1028SDavid Howells 169445b1028SDavid Howells for (i = 0; i < req->nr_pages; i++) 170445b1028SDavid Howells if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len)) 171445b1028SDavid Howells goto bad; 172445b1028SDavid Howells return true; 173445b1028SDavid Howells 174445b1028SDavid Howells bad: 175445b1028SDavid Howells pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n", 176445b1028SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 177445b1028SDavid Howells req->file_size, req->len, req->actual_len, req->remain); 178445b1028SDavid Howells pr_warn("DIR %llx %x %x %x\n", 179445b1028SDavid Howells req->pos, req->index, req->nr_pages, req->offset); 180445b1028SDavid Howells 181445b1028SDavid Howells for (i = 0; i < req->nr_pages; i++) { 182445b1028SDavid Howells dbuf = kmap(req->pages[i]); 183445b1028SDavid Howells for (j = 0; j < qty; j++) { 184445b1028SDavid Howells union afs_xdr_dir_block *block = &dbuf->blocks[j]; 185445b1028SDavid Howells 186445b1028SDavid Howells pr_warn("[%02x] %32phN\n", i * qty + j, block); 187445b1028SDavid Howells } 188445b1028SDavid Howells kunmap(req->pages[i]); 189445b1028SDavid Howells } 190445b1028SDavid Howells return false; 191445b1028SDavid Howells } 192445b1028SDavid Howells 193445b1028SDavid Howells /* 1941da177e4SLinus Torvalds * open an AFS directory file 1951da177e4SLinus Torvalds */ 1961da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 1971da177e4SLinus Torvalds { 1981da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 1991da177e4SLinus Torvalds 20000317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 20100317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 2021da177e4SLinus Torvalds 20308e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2041da177e4SLinus Torvalds return -ENOENT; 2051da177e4SLinus Torvalds 20600d3b7a4SDavid Howells return afs_open(inode, file); 207ec26815aSDavid Howells } 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds /* 210f3ddee8dSDavid Howells * Read the directory into the pagecache in one go, scrubbing the previous 211f3ddee8dSDavid Howells * contents. The list of pages is returned, pinning them so that they don't 212f3ddee8dSDavid Howells * get reclaimed during the iteration. 213f3ddee8dSDavid Howells */ 214f3ddee8dSDavid Howells static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) 215b61f7dcfSDavid Howells __acquires(&dvnode->validate_lock) 216f3ddee8dSDavid Howells { 217f3ddee8dSDavid Howells struct afs_read *req; 218f3ddee8dSDavid Howells loff_t i_size; 219f3ddee8dSDavid Howells int nr_pages, nr_inline, i, n; 220f3ddee8dSDavid Howells int ret = -ENOMEM; 221f3ddee8dSDavid Howells 222f3ddee8dSDavid Howells retry: 223f3ddee8dSDavid Howells i_size = i_size_read(&dvnode->vfs_inode); 224f3ddee8dSDavid Howells if (i_size < 2048) 225f51375cdSDavid Howells return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small)); 226f51375cdSDavid Howells if (i_size > 2048 * 1024) { 227f51375cdSDavid Howells trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); 228f3ddee8dSDavid Howells return ERR_PTR(-EFBIG); 229f51375cdSDavid Howells } 230f3ddee8dSDavid Howells 231f3ddee8dSDavid Howells _enter("%llu", i_size); 232f3ddee8dSDavid Howells 233f3ddee8dSDavid Howells /* Get a request record to hold the page list. We want to hold it 234f3ddee8dSDavid Howells * inline if we can, but we don't want to make an order 1 allocation. 235f3ddee8dSDavid Howells */ 236f3ddee8dSDavid Howells nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; 237f3ddee8dSDavid Howells nr_inline = nr_pages; 238f3ddee8dSDavid Howells if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) 239f3ddee8dSDavid Howells nr_inline = 0; 240f3ddee8dSDavid Howells 241ee102584SZhengyuan Liu req = kzalloc(struct_size(req, array, nr_inline), GFP_KERNEL); 242f3ddee8dSDavid Howells if (!req) 243f3ddee8dSDavid Howells return ERR_PTR(-ENOMEM); 244f3ddee8dSDavid Howells 245f3ddee8dSDavid Howells refcount_set(&req->usage, 1); 246f3ddee8dSDavid Howells req->nr_pages = nr_pages; 247f3ddee8dSDavid Howells req->actual_len = i_size; /* May change */ 248f3ddee8dSDavid Howells req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ 249f3ddee8dSDavid Howells req->data_version = dvnode->status.data_version; /* May change */ 250f3ddee8dSDavid Howells if (nr_inline > 0) { 251f3ddee8dSDavid Howells req->pages = req->array; 252f3ddee8dSDavid Howells } else { 253f3ddee8dSDavid Howells req->pages = kcalloc(nr_pages, sizeof(struct page *), 254f3ddee8dSDavid Howells GFP_KERNEL); 255f3ddee8dSDavid Howells if (!req->pages) 256f3ddee8dSDavid Howells goto error; 257f3ddee8dSDavid Howells } 258f3ddee8dSDavid Howells 259f3ddee8dSDavid Howells /* Get a list of all the pages that hold or will hold the directory 260f3ddee8dSDavid Howells * content. We need to fill in any gaps that we might find where the 261f3ddee8dSDavid Howells * memory reclaimer has been at work. If there are any gaps, we will 262f3ddee8dSDavid Howells * need to reread the entire directory contents. 263f3ddee8dSDavid Howells */ 264f3ddee8dSDavid Howells i = 0; 265f3ddee8dSDavid Howells do { 266f3ddee8dSDavid Howells n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, 267f3ddee8dSDavid Howells req->nr_pages - i, 268f3ddee8dSDavid Howells req->pages + i); 269f3ddee8dSDavid Howells _debug("find %u at %u/%u", n, i, req->nr_pages); 270f3ddee8dSDavid Howells if (n == 0) { 271f3ddee8dSDavid Howells gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; 272f3ddee8dSDavid Howells 273f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 274f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 275f3ddee8dSDavid Howells 276f3ddee8dSDavid Howells ret = -ENOMEM; 277f3ddee8dSDavid Howells req->pages[i] = __page_cache_alloc(gfp); 278f3ddee8dSDavid Howells if (!req->pages[i]) 279f3ddee8dSDavid Howells goto error; 280f3ddee8dSDavid Howells ret = add_to_page_cache_lru(req->pages[i], 281f3ddee8dSDavid Howells dvnode->vfs_inode.i_mapping, 282f3ddee8dSDavid Howells i, gfp); 283f3ddee8dSDavid Howells if (ret < 0) 284f3ddee8dSDavid Howells goto error; 285f3ddee8dSDavid Howells 286f3ddee8dSDavid Howells set_page_private(req->pages[i], 1); 287f3ddee8dSDavid Howells SetPagePrivate(req->pages[i]); 288f3ddee8dSDavid Howells unlock_page(req->pages[i]); 289f3ddee8dSDavid Howells i++; 290f3ddee8dSDavid Howells } else { 291f3ddee8dSDavid Howells i += n; 292f3ddee8dSDavid Howells } 293f3ddee8dSDavid Howells } while (i < req->nr_pages); 294f3ddee8dSDavid Howells 295f3ddee8dSDavid Howells /* If we're going to reload, we need to lock all the pages to prevent 296f3ddee8dSDavid Howells * races. 297f3ddee8dSDavid Howells */ 298f3ddee8dSDavid Howells ret = -ERESTARTSYS; 299b61f7dcfSDavid Howells if (down_read_killable(&dvnode->validate_lock) < 0) 300b61f7dcfSDavid Howells goto error; 301f3ddee8dSDavid Howells 302f3ddee8dSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 303f3ddee8dSDavid Howells goto success; 304f3ddee8dSDavid Howells 305b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 306b61f7dcfSDavid Howells if (down_write_killable(&dvnode->validate_lock) < 0) 307b61f7dcfSDavid Howells goto error; 308b61f7dcfSDavid Howells 309b61f7dcfSDavid Howells if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 31099987c56SDavid Howells trace_afs_reload_dir(dvnode); 311f3ddee8dSDavid Howells ret = afs_fetch_data(dvnode, key, req); 312f3ddee8dSDavid Howells if (ret < 0) 313b61f7dcfSDavid Howells goto error_unlock; 314f3ddee8dSDavid Howells 315f3ddee8dSDavid Howells task_io_account_read(PAGE_SIZE * req->nr_pages); 316f3ddee8dSDavid Howells 317f3ddee8dSDavid Howells if (req->len < req->file_size) 318f3ddee8dSDavid Howells goto content_has_grown; 319f3ddee8dSDavid Howells 320f3ddee8dSDavid Howells /* Validate the data we just read. */ 321f3ddee8dSDavid Howells ret = -EIO; 322445b1028SDavid Howells if (!afs_dir_check_pages(dvnode, req)) 323b61f7dcfSDavid Howells goto error_unlock; 324f3ddee8dSDavid Howells 325f3ddee8dSDavid Howells // TODO: Trim excess pages 326f3ddee8dSDavid Howells 327f3ddee8dSDavid Howells set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); 328f3ddee8dSDavid Howells } 329f3ddee8dSDavid Howells 330b61f7dcfSDavid Howells downgrade_write(&dvnode->validate_lock); 331f3ddee8dSDavid Howells success: 332f3ddee8dSDavid Howells return req; 333f3ddee8dSDavid Howells 334f3ddee8dSDavid Howells error_unlock: 335b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 336f3ddee8dSDavid Howells error: 337f3ddee8dSDavid Howells afs_put_read(req); 338f3ddee8dSDavid Howells _leave(" = %d", ret); 339f3ddee8dSDavid Howells return ERR_PTR(ret); 340f3ddee8dSDavid Howells 341f3ddee8dSDavid Howells content_has_grown: 342b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 343f3ddee8dSDavid Howells afs_put_read(req); 344f3ddee8dSDavid Howells goto retry; 345f3ddee8dSDavid Howells } 346f3ddee8dSDavid Howells 347f3ddee8dSDavid Howells /* 3481da177e4SLinus Torvalds * deal with one block in an AFS directory 3491da177e4SLinus Torvalds */ 350f51375cdSDavid Howells static int afs_dir_iterate_block(struct afs_vnode *dvnode, 351f51375cdSDavid Howells struct dir_context *ctx, 35200317636SDavid Howells union afs_xdr_dir_block *block, 3531bbae9f8SAl Viro unsigned blkoff) 3541da177e4SLinus Torvalds { 35500317636SDavid Howells union afs_xdr_dirent *dire; 3561da177e4SLinus Torvalds unsigned offset, next, curr; 3571da177e4SLinus Torvalds size_t nlen; 3581bbae9f8SAl Viro int tmp; 3591da177e4SLinus Torvalds 3601bbae9f8SAl Viro _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 3611da177e4SLinus Torvalds 36200317636SDavid Howells curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 3654ea219a8SDavid Howells for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); 3664ea219a8SDavid Howells offset < AFS_DIR_SLOTS_PER_BLOCK; 3671da177e4SLinus Torvalds offset = next 3681da177e4SLinus Torvalds ) { 3691da177e4SLinus Torvalds next = offset + 1; 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 37200317636SDavid Howells if (!(block->hdr.bitmap[offset / 8] & 3731da177e4SLinus Torvalds (1 << (offset % 8)))) { 3745b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 37500317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset); 3761da177e4SLinus Torvalds if (offset >= curr) 3771bbae9f8SAl Viro ctx->pos = blkoff + 37800317636SDavid Howells next * sizeof(union afs_xdr_dirent); 3791da177e4SLinus Torvalds continue; 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds /* got a valid entry */ 3831da177e4SLinus Torvalds dire = &block->dirents[offset]; 3841da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 3851da177e4SLinus Torvalds sizeof(*block) - 38600317636SDavid Howells offset * sizeof(union afs_xdr_dirent)); 3871da177e4SLinus Torvalds 3885b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: %s %zu \"%s\"", 38900317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset, 3901da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 3911da177e4SLinus Torvalds nlen, dire->u.name); 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds /* work out where the next possible entry is */ 39400317636SDavid Howells for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { 3954ea219a8SDavid Howells if (next >= AFS_DIR_SLOTS_PER_BLOCK) { 3965b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 3971da177e4SLinus Torvalds " %u travelled beyond end dir block" 3985b5e0928SAlexey Dobriyan " (len %u/%zu)", 39900317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4001da177e4SLinus Torvalds offset, next, tmp, nlen); 401f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_over_end); 4021da177e4SLinus Torvalds } 40300317636SDavid Howells if (!(block->hdr.bitmap[next / 8] & 4041da177e4SLinus Torvalds (1 << (next % 8)))) { 4055b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 4065b5e0928SAlexey Dobriyan " %u unmarked extension (len %u/%zu)", 40700317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4081da177e4SLinus Torvalds offset, next, tmp, nlen); 409f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds 4125b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: ext %u/%zu", 41300317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4141da177e4SLinus Torvalds next, tmp, nlen); 4151da177e4SLinus Torvalds next++; 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds /* skip if starts before the current position */ 4191da177e4SLinus Torvalds if (offset < curr) 4201da177e4SLinus Torvalds continue; 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds /* found the next entry */ 4231bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 4241da177e4SLinus Torvalds ntohl(dire->u.vnode), 4255cf9dd55SDavid Howells (ctx->actor == afs_lookup_filldir || 4265cf9dd55SDavid Howells ctx->actor == afs_lookup_one_filldir)? 4271bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 4281da177e4SLinus Torvalds _leave(" = 0 [full]"); 4291da177e4SLinus Torvalds return 0; 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 43200317636SDavid Howells ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds _leave(" = 1 [more]"); 4361da177e4SLinus Torvalds return 1; 437ec26815aSDavid Howells } 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds /* 44008e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 4411da177e4SLinus Torvalds */ 4421bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 4439dd0b82eSDavid Howells struct key *key, afs_dataversion_t *_dir_version) 4441da177e4SLinus Torvalds { 445f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 44600317636SDavid Howells struct afs_xdr_dir_page *dbuf; 44700317636SDavid Howells union afs_xdr_dir_block *dblock; 448f3ddee8dSDavid Howells struct afs_read *req; 4491da177e4SLinus Torvalds struct page *page; 4501da177e4SLinus Torvalds unsigned blkoff, limit; 4511da177e4SLinus Torvalds int ret; 4521da177e4SLinus Torvalds 4531bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 4541da177e4SLinus Torvalds 45508e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 4561da177e4SLinus Torvalds _leave(" = -ESTALE"); 4571da177e4SLinus Torvalds return -ESTALE; 4581da177e4SLinus Torvalds } 4591da177e4SLinus Torvalds 460f3ddee8dSDavid Howells req = afs_read_dir(dvnode, key); 461f3ddee8dSDavid Howells if (IS_ERR(req)) 462f3ddee8dSDavid Howells return PTR_ERR(req); 4639dd0b82eSDavid Howells *_dir_version = req->data_version; 464f3ddee8dSDavid Howells 4651da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 46600317636SDavid Howells ctx->pos += sizeof(union afs_xdr_dirent) - 1; 46700317636SDavid Howells ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds /* walk through the blocks in sequence */ 4701da177e4SLinus Torvalds ret = 0; 471f3ddee8dSDavid Howells while (ctx->pos < req->actual_len) { 47200317636SDavid Howells blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); 4731da177e4SLinus Torvalds 474f3ddee8dSDavid Howells /* Fetch the appropriate page from the directory and re-add it 475f3ddee8dSDavid Howells * to the LRU. 476f3ddee8dSDavid Howells */ 477f3ddee8dSDavid Howells page = req->pages[blkoff / PAGE_SIZE]; 478f3ddee8dSDavid Howells if (!page) { 479f51375cdSDavid Howells ret = afs_bad(dvnode, afs_file_error_dir_missing_page); 4801da177e4SLinus Torvalds break; 4811da177e4SLinus Torvalds } 482f3ddee8dSDavid Howells mark_page_accessed(page); 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 4851da177e4SLinus Torvalds 486f3ddee8dSDavid Howells dbuf = kmap(page); 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 4891da177e4SLinus Torvalds do { 4901da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 49100317636SDavid Howells sizeof(union afs_xdr_dir_block)]; 492f51375cdSDavid Howells ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff); 4931da177e4SLinus Torvalds if (ret != 1) { 494f3ddee8dSDavid Howells kunmap(page); 4951da177e4SLinus Torvalds goto out; 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds 49800317636SDavid Howells blkoff += sizeof(union afs_xdr_dir_block); 4991da177e4SLinus Torvalds 5001bbae9f8SAl Viro } while (ctx->pos < dir->i_size && blkoff < limit); 5011da177e4SLinus Torvalds 502f3ddee8dSDavid Howells kunmap(page); 5031da177e4SLinus Torvalds ret = 0; 5041da177e4SLinus Torvalds } 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds out: 507b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 508f3ddee8dSDavid Howells afs_put_read(req); 5091da177e4SLinus Torvalds _leave(" = %d", ret); 5101da177e4SLinus Torvalds return ret; 511ec26815aSDavid Howells } 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds /* 5141da177e4SLinus Torvalds * read an AFS directory 5151da177e4SLinus Torvalds */ 5161bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 5171da177e4SLinus Torvalds { 5189dd0b82eSDavid Howells afs_dataversion_t dir_version; 5199dd0b82eSDavid Howells 5209dd0b82eSDavid Howells return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file), 5219dd0b82eSDavid Howells &dir_version); 522ec26815aSDavid Howells } 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds /* 5255cf9dd55SDavid Howells * Search the directory for a single name 5261da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5271da177e4SLinus Torvalds * uniquifier through dtype 5281da177e4SLinus Torvalds */ 5295cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, 530ac7576f4SMiklos Szeredi int nlen, loff_t fpos, u64 ino, unsigned dtype) 5311da177e4SLinus Torvalds { 5325cf9dd55SDavid Howells struct afs_lookup_one_cookie *cookie = 5335cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_one_cookie, ctx); 5341da177e4SLinus Torvalds 5351bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 5361bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 537ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 5381da177e4SLinus Torvalds 53908e0e7c8SDavid Howells /* insanity checks first */ 54000317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 54100317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 54208e0e7c8SDavid Howells 5431bbae9f8SAl Viro if (cookie->name.len != nlen || 5441bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 5451da177e4SLinus Torvalds _leave(" = 0 [no]"); 5461da177e4SLinus Torvalds return 0; 5471da177e4SLinus Torvalds } 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds cookie->fid.vnode = ino; 5501da177e4SLinus Torvalds cookie->fid.unique = dtype; 5511da177e4SLinus Torvalds cookie->found = 1; 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds _leave(" = -1 [found]"); 5541da177e4SLinus Torvalds return -1; 555ec26815aSDavid Howells } 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds /* 5585cf9dd55SDavid Howells * Do a lookup of a single name in a directory 559260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 5601da177e4SLinus Torvalds */ 5615cf9dd55SDavid Howells static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, 5629dd0b82eSDavid Howells struct afs_fid *fid, struct key *key, 5639dd0b82eSDavid Howells afs_dataversion_t *_dir_version) 5641da177e4SLinus Torvalds { 5651bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 5665cf9dd55SDavid Howells struct afs_lookup_one_cookie cookie = { 5675cf9dd55SDavid Howells .ctx.actor = afs_lookup_one_filldir, 5681bbae9f8SAl Viro .name = dentry->d_name, 5691bbae9f8SAl Viro .fid.vid = as->volume->vid 5701bbae9f8SAl Viro }; 5711da177e4SLinus Torvalds int ret; 5721da177e4SLinus Torvalds 573a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 5741da177e4SLinus Torvalds 5751da177e4SLinus Torvalds /* search the directory */ 5769dd0b82eSDavid Howells ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version); 5771da177e4SLinus Torvalds if (ret < 0) { 57808e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 57908e0e7c8SDavid Howells return ret; 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds ret = -ENOENT; 5831da177e4SLinus Torvalds if (!cookie.found) { 58408e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 58508e0e7c8SDavid Howells return -ENOENT; 58608e0e7c8SDavid Howells } 58708e0e7c8SDavid Howells 58808e0e7c8SDavid Howells *fid = cookie.fid; 5893b6492dfSDavid Howells _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); 59008e0e7c8SDavid Howells return 0; 59108e0e7c8SDavid Howells } 59208e0e7c8SDavid Howells 59308e0e7c8SDavid Howells /* 5945cf9dd55SDavid Howells * search the directory for a name 5955cf9dd55SDavid Howells * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5965cf9dd55SDavid Howells * uniquifier through dtype 5975cf9dd55SDavid Howells */ 5985cf9dd55SDavid Howells static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 5995cf9dd55SDavid Howells int nlen, loff_t fpos, u64 ino, unsigned dtype) 6005cf9dd55SDavid Howells { 6015cf9dd55SDavid Howells struct afs_lookup_cookie *cookie = 6025cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_cookie, ctx); 6035cf9dd55SDavid Howells int ret; 6045cf9dd55SDavid Howells 6055cf9dd55SDavid Howells _enter("{%s,%u},%s,%u,,%llu,%u", 6065cf9dd55SDavid Howells cookie->name.name, cookie->name.len, name, nlen, 6075cf9dd55SDavid Howells (unsigned long long) ino, dtype); 6085cf9dd55SDavid Howells 6095cf9dd55SDavid Howells /* insanity checks first */ 61000317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 61100317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 6125cf9dd55SDavid Howells 6135cf9dd55SDavid Howells if (cookie->found) { 6145cf9dd55SDavid Howells if (cookie->nr_fids < 50) { 6155cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].vnode = ino; 6165cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].unique = dtype; 6175cf9dd55SDavid Howells cookie->nr_fids++; 6185cf9dd55SDavid Howells } 6195cf9dd55SDavid Howells } else if (cookie->name.len == nlen && 6205cf9dd55SDavid Howells memcmp(cookie->name.name, name, nlen) == 0) { 6215cf9dd55SDavid Howells cookie->fids[0].vnode = ino; 6225cf9dd55SDavid Howells cookie->fids[0].unique = dtype; 6235cf9dd55SDavid Howells cookie->found = 1; 6245cf9dd55SDavid Howells if (cookie->one_only) 6255cf9dd55SDavid Howells return -1; 6265cf9dd55SDavid Howells } 6275cf9dd55SDavid Howells 6285cf9dd55SDavid Howells ret = cookie->nr_fids >= 50 ? -1 : 0; 6295cf9dd55SDavid Howells _leave(" = %d", ret); 6305cf9dd55SDavid Howells return ret; 6315cf9dd55SDavid Howells } 6325cf9dd55SDavid Howells 6335cf9dd55SDavid Howells /* 6345cf9dd55SDavid Howells * Do a lookup in a directory. We make use of bulk lookup to query a slew of 6355cf9dd55SDavid Howells * files in one go and create inodes for them. The inode of the file we were 6365cf9dd55SDavid Howells * asked for is returned. 6375cf9dd55SDavid Howells */ 6385cf9dd55SDavid Howells static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 6395cf9dd55SDavid Howells struct key *key) 6405cf9dd55SDavid Howells { 6415cf9dd55SDavid Howells struct afs_lookup_cookie *cookie; 642f642404aSDavid Howells struct afs_cb_interest *dcbi, *cbi = NULL; 6435cf9dd55SDavid Howells struct afs_super_info *as = dir->i_sb->s_fs_info; 64487182759SDavid Howells struct afs_status_cb *scb; 645b8359153SDavid Howells struct afs_iget_data iget_data; 6465cf9dd55SDavid Howells struct afs_fs_cursor fc; 647f642404aSDavid Howells struct afs_server *server; 64839db9815SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; 64939db9815SDavid Howells struct inode *inode = NULL, *ti; 6509dd0b82eSDavid Howells afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version); 6515cf9dd55SDavid Howells int ret, i; 6525cf9dd55SDavid Howells 6535cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 6545cf9dd55SDavid Howells 6555cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 6565cf9dd55SDavid Howells if (!cookie) 6575cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 6585cf9dd55SDavid Howells 6595cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 6605cf9dd55SDavid Howells cookie->name = dentry->d_name; 66113fcc635SDavid Howells cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want 66213fcc635SDavid Howells * and slot 1 for the directory */ 6635cf9dd55SDavid Howells 6645cf9dd55SDavid Howells read_seqlock_excl(&dvnode->cb_lock); 665f642404aSDavid Howells dcbi = rcu_dereference_protected(dvnode->cb_interest, 666f642404aSDavid Howells lockdep_is_held(&dvnode->cb_lock.lock)); 667f642404aSDavid Howells if (dcbi) { 668f642404aSDavid Howells server = dcbi->server; 669f642404aSDavid Howells if (server && 670f642404aSDavid Howells test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags)) 6715cf9dd55SDavid Howells cookie->one_only = true; 672f642404aSDavid Howells } 6735cf9dd55SDavid Howells read_sequnlock_excl(&dvnode->cb_lock); 6745cf9dd55SDavid Howells 6755cf9dd55SDavid Howells for (i = 0; i < 50; i++) 6765cf9dd55SDavid Howells cookie->fids[i].vid = as->volume->vid; 6775cf9dd55SDavid Howells 6785cf9dd55SDavid Howells /* search the directory */ 6799dd0b82eSDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version); 6805cf9dd55SDavid Howells if (ret < 0) { 6815cf9dd55SDavid Howells inode = ERR_PTR(ret); 6825cf9dd55SDavid Howells goto out; 6835cf9dd55SDavid Howells } 6845cf9dd55SDavid Howells 6859dd0b82eSDavid Howells dentry->d_fsdata = (void *)(unsigned long)data_version; 6869dd0b82eSDavid Howells 6875cf9dd55SDavid Howells inode = ERR_PTR(-ENOENT); 6885cf9dd55SDavid Howells if (!cookie->found) 6895cf9dd55SDavid Howells goto out; 6905cf9dd55SDavid Howells 6915cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 692b8359153SDavid Howells iget_data.fid = cookie->fids[0]; 693b8359153SDavid Howells iget_data.volume = dvnode->volume; 694b8359153SDavid Howells iget_data.cb_v_break = dvnode->volume->cb_v_break; 695b8359153SDavid Howells iget_data.cb_s_break = 0; 696b8359153SDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, 697b8359153SDavid Howells afs_iget5_test, &iget_data); 6985cf9dd55SDavid Howells if (inode) 6995cf9dd55SDavid Howells goto out; 7005cf9dd55SDavid Howells 7015cf9dd55SDavid Howells /* Need space for examining all the selected files */ 7025cf9dd55SDavid Howells inode = ERR_PTR(-ENOMEM); 70387182759SDavid Howells cookie->statuses = kvcalloc(cookie->nr_fids, sizeof(struct afs_status_cb), 7045cf9dd55SDavid Howells GFP_KERNEL); 7055cf9dd55SDavid Howells if (!cookie->statuses) 7065cf9dd55SDavid Howells goto out; 7075cf9dd55SDavid Howells 70839db9815SDavid Howells cookie->inodes = kcalloc(cookie->nr_fids, sizeof(struct inode *), 70939db9815SDavid Howells GFP_KERNEL); 71039db9815SDavid Howells if (!cookie->inodes) 71139db9815SDavid Howells goto out_s; 71239db9815SDavid Howells 71313fcc635SDavid Howells cookie->fids[1] = dvnode->fid; 71413fcc635SDavid Howells cookie->statuses[1].cb_break = afs_calc_vnode_cb_break(dvnode); 71513fcc635SDavid Howells cookie->inodes[1] = igrab(&dvnode->vfs_inode); 71613fcc635SDavid Howells 71713fcc635SDavid Howells for (i = 2; i < cookie->nr_fids; i++) { 71839db9815SDavid Howells scb = &cookie->statuses[i]; 71939db9815SDavid Howells 72039db9815SDavid Howells /* Find any inodes that already exist and get their 72139db9815SDavid Howells * callback counters. 72239db9815SDavid Howells */ 72339db9815SDavid Howells iget_data.fid = cookie->fids[i]; 72439db9815SDavid Howells ti = ilookup5_nowait(dir->i_sb, iget_data.fid.vnode, 72539db9815SDavid Howells afs_iget5_test, &iget_data); 72639db9815SDavid Howells if (!IS_ERR_OR_NULL(ti)) { 72739db9815SDavid Howells vnode = AFS_FS_I(ti); 72839db9815SDavid Howells scb->cb_break = afs_calc_vnode_cb_break(vnode); 72939db9815SDavid Howells cookie->inodes[i] = ti; 73039db9815SDavid Howells } 73139db9815SDavid Howells } 73239db9815SDavid Howells 7335cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 7345cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 7355cf9dd55SDavid Howells * the whole operation. 7365cf9dd55SDavid Howells */ 7375cf9dd55SDavid Howells if (cookie->one_only) 7385cf9dd55SDavid Howells goto no_inline_bulk_status; 7395cf9dd55SDavid Howells 7405cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 74120b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 7425cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 7435cf9dd55SDavid Howells if (test_bit(AFS_SERVER_FL_NO_IBULK, 7445cf9dd55SDavid Howells &fc.cbi->server->flags)) { 7455cf9dd55SDavid Howells fc.ac.abort_code = RX_INVALID_OPERATION; 7465cf9dd55SDavid Howells fc.ac.error = -ECONNABORTED; 7475cf9dd55SDavid Howells break; 7485cf9dd55SDavid Howells } 749b8359153SDavid Howells iget_data.cb_v_break = dvnode->volume->cb_v_break; 750b8359153SDavid Howells iget_data.cb_s_break = fc.cbi->server->cb_s_break; 7515cf9dd55SDavid Howells afs_fs_inline_bulk_status(&fc, 7525cf9dd55SDavid Howells afs_v2net(dvnode), 7535cf9dd55SDavid Howells cookie->fids, 7545cf9dd55SDavid Howells cookie->statuses, 7555cf9dd55SDavid Howells cookie->nr_fids, NULL); 7565cf9dd55SDavid Howells } 7575cf9dd55SDavid Howells 7585cf9dd55SDavid Howells if (fc.ac.error == 0) 7595cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 7605cf9dd55SDavid Howells if (fc.ac.abort_code == RX_INVALID_OPERATION) 7615cf9dd55SDavid Howells set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); 7625cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 7635cf9dd55SDavid Howells } 7645cf9dd55SDavid Howells 7655cf9dd55SDavid Howells if (!IS_ERR(inode)) 7665cf9dd55SDavid Howells goto success; 7675cf9dd55SDavid Howells if (fc.ac.abort_code != RX_INVALID_OPERATION) 7685cf9dd55SDavid Howells goto out_c; 7695cf9dd55SDavid Howells 7705cf9dd55SDavid Howells no_inline_bulk_status: 7715cf9dd55SDavid Howells /* We could try FS.BulkStatus next, but this aborts the entire op if 7725cf9dd55SDavid Howells * any of the lookups fails - so, for the moment, revert to 7735cf9dd55SDavid Howells * FS.FetchStatus for just the primary fid. 7745cf9dd55SDavid Howells */ 7755cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 77620b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 7775cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 778b8359153SDavid Howells iget_data.cb_v_break = dvnode->volume->cb_v_break; 779b8359153SDavid Howells iget_data.cb_s_break = fc.cbi->server->cb_s_break; 78087182759SDavid Howells scb = &cookie->statuses[0]; 7815cf9dd55SDavid Howells afs_fs_fetch_status(&fc, 7825cf9dd55SDavid Howells afs_v2net(dvnode), 7835cf9dd55SDavid Howells cookie->fids, 784a58823acSDavid Howells scb, 7855cf9dd55SDavid Howells NULL); 7865cf9dd55SDavid Howells } 7875cf9dd55SDavid Howells 7885cf9dd55SDavid Howells if (fc.ac.error == 0) 7895cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 7905cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 7915cf9dd55SDavid Howells } 7925cf9dd55SDavid Howells 7935cf9dd55SDavid Howells if (IS_ERR(inode)) 7945cf9dd55SDavid Howells goto out_c; 7955cf9dd55SDavid Howells 7965cf9dd55SDavid Howells success: 7975cf9dd55SDavid Howells /* Turn all the files into inodes and save the first one - which is the 7985cf9dd55SDavid Howells * one we actually want. 7995cf9dd55SDavid Howells */ 80087182759SDavid Howells scb = &cookie->statuses[0]; 80187182759SDavid Howells if (scb->status.abort_code != 0) 80287182759SDavid Howells inode = ERR_PTR(afs_abort_to_error(scb->status.abort_code)); 8035cf9dd55SDavid Howells 8045cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) { 80587182759SDavid Howells struct afs_status_cb *scb = &cookie->statuses[i]; 80639db9815SDavid Howells 80739db9815SDavid Howells if (!scb->have_status && !scb->have_error) 80839db9815SDavid Howells continue; 80939db9815SDavid Howells 81039db9815SDavid Howells if (cookie->inodes[i]) { 811a28f239eSDavid Howells struct afs_vnode *iv = AFS_FS_I(cookie->inodes[i]); 812a28f239eSDavid Howells 813a28f239eSDavid Howells if (test_bit(AFS_VNODE_UNSET, &iv->flags)) 814a28f239eSDavid Howells continue; 815a28f239eSDavid Howells 816a28f239eSDavid Howells afs_vnode_commit_status(&fc, iv, 81739db9815SDavid Howells scb->cb_break, NULL, scb); 81839db9815SDavid Howells continue; 81939db9815SDavid Howells } 8205cf9dd55SDavid Howells 82187182759SDavid Howells if (scb->status.abort_code != 0) 8225cf9dd55SDavid Howells continue; 8235cf9dd55SDavid Howells 824b8359153SDavid Howells iget_data.fid = cookie->fids[i]; 825b8359153SDavid Howells ti = afs_iget(dir->i_sb, key, &iget_data, scb, cbi, dvnode); 82639db9815SDavid Howells if (!IS_ERR(ti)) 82739db9815SDavid Howells afs_cache_permit(AFS_FS_I(ti), key, 82839db9815SDavid Howells 0 /* Assume vnode->cb_break is 0 */ + 82939db9815SDavid Howells iget_data.cb_v_break, 83039db9815SDavid Howells scb); 8315cf9dd55SDavid Howells if (i == 0) { 8325cf9dd55SDavid Howells inode = ti; 8335cf9dd55SDavid Howells } else { 8345cf9dd55SDavid Howells if (!IS_ERR(ti)) 8355cf9dd55SDavid Howells iput(ti); 8365cf9dd55SDavid Howells } 8375cf9dd55SDavid Howells } 8385cf9dd55SDavid Howells 8395cf9dd55SDavid Howells out_c: 8405cf9dd55SDavid Howells afs_put_cb_interest(afs_v2net(dvnode), cbi); 84139db9815SDavid Howells if (cookie->inodes) { 84239db9815SDavid Howells for (i = 0; i < cookie->nr_fids; i++) 84339db9815SDavid Howells iput(cookie->inodes[i]); 84439db9815SDavid Howells kfree(cookie->inodes); 84539db9815SDavid Howells } 84639db9815SDavid Howells out_s: 84787182759SDavid Howells kvfree(cookie->statuses); 8485cf9dd55SDavid Howells out: 8495cf9dd55SDavid Howells kfree(cookie); 8505cf9dd55SDavid Howells return inode; 8515cf9dd55SDavid Howells } 8525cf9dd55SDavid Howells 8535cf9dd55SDavid Howells /* 8546f8880d8SDavid Howells * Look up an entry in a directory with @sys substitution. 8556f8880d8SDavid Howells */ 8566f8880d8SDavid Howells static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 8576f8880d8SDavid Howells struct key *key) 8586f8880d8SDavid Howells { 8596f8880d8SDavid Howells struct afs_sysnames *subs; 8606f8880d8SDavid Howells struct afs_net *net = afs_i2net(dir); 8616f8880d8SDavid Howells struct dentry *ret; 8626f8880d8SDavid Howells char *buf, *p, *name; 8636f8880d8SDavid Howells int len, i; 8646f8880d8SDavid Howells 8656f8880d8SDavid Howells _enter(""); 8666f8880d8SDavid Howells 8676f8880d8SDavid Howells ret = ERR_PTR(-ENOMEM); 8686f8880d8SDavid Howells p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 8696f8880d8SDavid Howells if (!buf) 8706f8880d8SDavid Howells goto out_p; 8716f8880d8SDavid Howells if (dentry->d_name.len > 4) { 8726f8880d8SDavid Howells memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 8736f8880d8SDavid Howells p += dentry->d_name.len - 4; 8746f8880d8SDavid Howells } 8756f8880d8SDavid Howells 8766f8880d8SDavid Howells /* There is an ordered list of substitutes that we have to try. */ 8776f8880d8SDavid Howells read_lock(&net->sysnames_lock); 8786f8880d8SDavid Howells subs = net->sysnames; 8796f8880d8SDavid Howells refcount_inc(&subs->usage); 8806f8880d8SDavid Howells read_unlock(&net->sysnames_lock); 8816f8880d8SDavid Howells 8826f8880d8SDavid Howells for (i = 0; i < subs->nr; i++) { 8836f8880d8SDavid Howells name = subs->subs[i]; 8846f8880d8SDavid Howells len = dentry->d_name.len - 4 + strlen(name); 8856f8880d8SDavid Howells if (len >= AFSNAMEMAX) { 8866f8880d8SDavid Howells ret = ERR_PTR(-ENAMETOOLONG); 8876f8880d8SDavid Howells goto out_s; 8886f8880d8SDavid Howells } 8896f8880d8SDavid Howells 8906f8880d8SDavid Howells strcpy(p, name); 8916f8880d8SDavid Howells ret = lookup_one_len(buf, dentry->d_parent, len); 8926f8880d8SDavid Howells if (IS_ERR(ret) || d_is_positive(ret)) 8936f8880d8SDavid Howells goto out_s; 8946f8880d8SDavid Howells dput(ret); 8956f8880d8SDavid Howells } 8966f8880d8SDavid Howells 8976f8880d8SDavid Howells /* We don't want to d_add() the @sys dentry here as we don't want to 8986f8880d8SDavid Howells * the cached dentry to hide changes to the sysnames list. 8996f8880d8SDavid Howells */ 9006f8880d8SDavid Howells ret = NULL; 9016f8880d8SDavid Howells out_s: 9026f8880d8SDavid Howells afs_put_sysnames(subs); 9036f8880d8SDavid Howells kfree(buf); 9046f8880d8SDavid Howells out_p: 9056f8880d8SDavid Howells key_put(key); 9066f8880d8SDavid Howells return ret; 9076f8880d8SDavid Howells } 9086f8880d8SDavid Howells 9096f8880d8SDavid Howells /* 91008e0e7c8SDavid Howells * look up an entry in a directory 91108e0e7c8SDavid Howells */ 912260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 91300cd8dd3SAl Viro unsigned int flags) 91408e0e7c8SDavid Howells { 9155cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 91640a708bdSDavid Howells struct afs_fid fid = {}; 91708e0e7c8SDavid Howells struct inode *inode; 91834b2a88fSAl Viro struct dentry *d; 91900d3b7a4SDavid Howells struct key *key; 92008e0e7c8SDavid Howells int ret; 92108e0e7c8SDavid Howells 9223b6492dfSDavid Howells _enter("{%llx:%llu},%p{%pd},", 9235cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 924260a9803SDavid Howells 9252b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 92608e0e7c8SDavid Howells 92745222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 92808e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 92908e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 93008e0e7c8SDavid Howells } 93108e0e7c8SDavid Howells 9325cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 93308e0e7c8SDavid Howells _leave(" = -ESTALE"); 93408e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 93508e0e7c8SDavid Howells } 93608e0e7c8SDavid Howells 9375cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 93800d3b7a4SDavid Howells if (IS_ERR(key)) { 93900d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 940e231c2eeSDavid Howells return ERR_CAST(key); 94100d3b7a4SDavid Howells } 94200d3b7a4SDavid Howells 9435cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 94408e0e7c8SDavid Howells if (ret < 0) { 94500d3b7a4SDavid Howells key_put(key); 946260a9803SDavid Howells _leave(" = %d [val]", ret); 9471da177e4SLinus Torvalds return ERR_PTR(ret); 9481da177e4SLinus Torvalds } 9491da177e4SLinus Torvalds 9506f8880d8SDavid Howells if (dentry->d_name.len >= 4 && 9516f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 4] == '@' && 9526f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 3] == 's' && 9536f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 9546f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 1] == 's') 9556f8880d8SDavid Howells return afs_lookup_atsys(dir, dentry, key); 9566f8880d8SDavid Howells 957d55b4da4SDavid Howells afs_stat_v(dvnode, n_lookup); 9585cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 95934b2a88fSAl Viro key_put(key); 960f52b83b0SDavid Howells if (inode == ERR_PTR(-ENOENT)) 9615cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 96240a708bdSDavid Howells 96340a708bdSDavid Howells if (!IS_ERR_OR_NULL(inode)) 96440a708bdSDavid Howells fid = AFS_FS_I(inode)->fid; 96540a708bdSDavid Howells 96634b2a88fSAl Viro d = d_splice_alias(inode, dentry); 96780548b03SDavid Howells if (!IS_ERR_OR_NULL(d)) { 96834b2a88fSAl Viro d->d_fsdata = dentry->d_fsdata; 96940a708bdSDavid Howells trace_afs_lookup(dvnode, &d->d_name, &fid); 97080548b03SDavid Howells } else { 97140a708bdSDavid Howells trace_afs_lookup(dvnode, &dentry->d_name, &fid); 97280548b03SDavid Howells } 97334b2a88fSAl Viro return d; 974ec26815aSDavid Howells } 9751da177e4SLinus Torvalds 9761da177e4SLinus Torvalds /* 977a0753c29SDavid Howells * Check the validity of a dentry under RCU conditions. 978a0753c29SDavid Howells */ 979a0753c29SDavid Howells static int afs_d_revalidate_rcu(struct dentry *dentry) 980a0753c29SDavid Howells { 981a0753c29SDavid Howells struct afs_vnode *dvnode, *vnode; 982a0753c29SDavid Howells struct dentry *parent; 983a0753c29SDavid Howells struct inode *dir, *inode; 984a0753c29SDavid Howells long dir_version, de_version; 985a0753c29SDavid Howells 986a0753c29SDavid Howells _enter("%p", dentry); 987a0753c29SDavid Howells 988a0753c29SDavid Howells /* Check the parent directory is still valid first. */ 989a0753c29SDavid Howells parent = READ_ONCE(dentry->d_parent); 990a0753c29SDavid Howells dir = d_inode_rcu(parent); 991a0753c29SDavid Howells if (!dir) 992a0753c29SDavid Howells return -ECHILD; 993a0753c29SDavid Howells dvnode = AFS_FS_I(dir); 994a0753c29SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) 995a0753c29SDavid Howells return -ECHILD; 996a0753c29SDavid Howells 997a0753c29SDavid Howells if (!afs_check_validity(dvnode)) 998a0753c29SDavid Howells return -ECHILD; 999a0753c29SDavid Howells 1000a0753c29SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 1001a0753c29SDavid Howells * behind our back. If we made the change, it's no problem. Note that 1002a0753c29SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 1003a0753c29SDavid Howells * version. 1004a0753c29SDavid Howells */ 1005a0753c29SDavid Howells dir_version = (long)READ_ONCE(dvnode->status.data_version); 1006a0753c29SDavid Howells de_version = (long)READ_ONCE(dentry->d_fsdata); 1007a0753c29SDavid Howells if (de_version != dir_version) { 1008a0753c29SDavid Howells dir_version = (long)READ_ONCE(dvnode->invalid_before); 1009a0753c29SDavid Howells if (de_version - dir_version < 0) 1010a0753c29SDavid Howells return -ECHILD; 1011a0753c29SDavid Howells } 1012a0753c29SDavid Howells 1013a0753c29SDavid Howells /* Check to see if the vnode referred to by the dentry still 1014a0753c29SDavid Howells * has a callback. 1015a0753c29SDavid Howells */ 1016a0753c29SDavid Howells if (d_really_is_positive(dentry)) { 1017a0753c29SDavid Howells inode = d_inode_rcu(dentry); 1018a0753c29SDavid Howells if (inode) { 1019a0753c29SDavid Howells vnode = AFS_FS_I(inode); 1020a0753c29SDavid Howells if (!afs_check_validity(vnode)) 1021a0753c29SDavid Howells return -ECHILD; 1022a0753c29SDavid Howells } 1023a0753c29SDavid Howells } 1024a0753c29SDavid Howells 1025a0753c29SDavid Howells return 1; /* Still valid */ 1026a0753c29SDavid Howells } 1027a0753c29SDavid Howells 1028a0753c29SDavid Howells /* 10291da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 10301da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 10311da177e4SLinus Torvalds * inode 10321da177e4SLinus Torvalds */ 10330b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 10341da177e4SLinus Torvalds { 1035260a9803SDavid Howells struct afs_vnode *vnode, *dir; 1036dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 10371da177e4SLinus Torvalds struct dentry *parent; 1038c435ee34SDavid Howells struct inode *inode; 103900d3b7a4SDavid Howells struct key *key; 104040fc8102SDavid Howells afs_dataversion_t dir_version, invalid_before; 10419dd0b82eSDavid Howells long de_version; 10421da177e4SLinus Torvalds int ret; 10431da177e4SLinus Torvalds 10440b728e19SAl Viro if (flags & LOOKUP_RCU) 1045a0753c29SDavid Howells return afs_d_revalidate_rcu(dentry); 104634286d66SNick Piggin 1047c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 10482b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 10493b6492dfSDavid Howells _enter("{v={%llx:%llu} n=%pd fl=%lx},", 1050a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 1051260a9803SDavid Howells vnode->flags); 1052c435ee34SDavid Howells } else { 1053a455589fSAl Viro _enter("{neg n=%pd}", dentry); 1054c435ee34SDavid Howells } 10551da177e4SLinus Torvalds 1056260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 105700d3b7a4SDavid Howells if (IS_ERR(key)) 105800d3b7a4SDavid Howells key = NULL; 105900d3b7a4SDavid Howells 1060c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 1061c435ee34SDavid Howells inode = d_inode(dentry); 1062c435ee34SDavid Howells if (inode) { 1063c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1064c435ee34SDavid Howells afs_validate(vnode, key); 1065c435ee34SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1066c435ee34SDavid Howells goto out_bad; 1067c435ee34SDavid Howells } 1068c435ee34SDavid Howells } 1069c435ee34SDavid Howells 10701da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 107108e0e7c8SDavid Howells parent = dget_parent(dentry); 10722b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 10731da177e4SLinus Torvalds 1074260a9803SDavid Howells /* validate the parent directory */ 1075260a9803SDavid Howells afs_validate(dir, key); 1076260a9803SDavid Howells 1077260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 1078a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 1079c435ee34SDavid Howells goto out_bad_parent; 10801da177e4SLinus Torvalds } 10811da177e4SLinus Torvalds 1082a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 1083a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 1084a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 1085a4ff7401SDavid Howells * version. 1086a4ff7401SDavid Howells */ 10879dd0b82eSDavid Howells dir_version = dir->status.data_version; 1088a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 10899dd0b82eSDavid Howells if (de_version == (long)dir_version) 10905dc84855SDavid Howells goto out_valid_noupdate; 1091a4ff7401SDavid Howells 109240fc8102SDavid Howells invalid_before = dir->invalid_before; 109340fc8102SDavid Howells if (de_version - (long)invalid_before >= 0) 1094a4ff7401SDavid Howells goto out_valid; 1095260a9803SDavid Howells 109608e0e7c8SDavid Howells _debug("dir modified"); 1097d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 10981da177e4SLinus Torvalds 10991da177e4SLinus Torvalds /* search the directory for this vnode */ 11009dd0b82eSDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version); 1101260a9803SDavid Howells switch (ret) { 1102260a9803SDavid Howells case 0: 1103260a9803SDavid Howells /* the filename maps to something */ 11042b0143b5SDavid Howells if (d_really_is_negative(dentry)) 1105c435ee34SDavid Howells goto out_bad_parent; 1106c435ee34SDavid Howells inode = d_inode(dentry); 1107c435ee34SDavid Howells if (is_bad_inode(inode)) { 1108a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 1109a455589fSAl Viro dentry); 1110c435ee34SDavid Howells goto out_bad_parent; 11111da177e4SLinus Torvalds } 11121da177e4SLinus Torvalds 1113c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1114c435ee34SDavid Howells 11151da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 11161da177e4SLinus Torvalds * different file */ 111708e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 11183b6492dfSDavid Howells _debug("%pd: dirent changed [%llu != %llu]", 1119a455589fSAl Viro dentry, fid.vnode, 112008e0e7c8SDavid Howells vnode->fid.vnode); 11211da177e4SLinus Torvalds goto not_found; 11221da177e4SLinus Torvalds } 11231da177e4SLinus Torvalds 11241da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 1125260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 1126260a9803SDavid Howells * been reused */ 112708e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 1128a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 1129a455589fSAl Viro dentry, fid.unique, 11307a224228SJean Noel Cordenner vnode->fid.unique, 1131c435ee34SDavid Howells vnode->vfs_inode.i_generation); 1132c435ee34SDavid Howells write_seqlock(&vnode->cb_lock); 113308e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1134c435ee34SDavid Howells write_sequnlock(&vnode->cb_lock); 1135260a9803SDavid Howells goto not_found; 1136260a9803SDavid Howells } 1137260a9803SDavid Howells goto out_valid; 1138260a9803SDavid Howells 1139260a9803SDavid Howells case -ENOENT: 1140260a9803SDavid Howells /* the filename is unknown */ 1141a455589fSAl Viro _debug("%pd: dirent not found", dentry); 11422b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1143260a9803SDavid Howells goto not_found; 1144260a9803SDavid Howells goto out_valid; 1145260a9803SDavid Howells 1146260a9803SDavid Howells default: 1147a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1148a455589fSAl Viro parent, ret); 1149c435ee34SDavid Howells goto out_bad_parent; 11501da177e4SLinus Torvalds } 115108e0e7c8SDavid Howells 11521da177e4SLinus Torvalds out_valid: 11539dd0b82eSDavid Howells dentry->d_fsdata = (void *)(unsigned long)dir_version; 11545dc84855SDavid Howells out_valid_noupdate: 11551da177e4SLinus Torvalds dput(parent); 115600d3b7a4SDavid Howells key_put(key); 11571da177e4SLinus Torvalds _leave(" = 1 [valid]"); 11581da177e4SLinus Torvalds return 1; 11591da177e4SLinus Torvalds 11601da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 11611da177e4SLinus Torvalds not_found: 11621da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 11631da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 11641da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 11651da177e4SLinus Torvalds 1166c435ee34SDavid Howells out_bad_parent: 1167a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 11681da177e4SLinus Torvalds dput(parent); 1169c435ee34SDavid Howells out_bad: 117000d3b7a4SDavid Howells key_put(key); 11711da177e4SLinus Torvalds 11721da177e4SLinus Torvalds _leave(" = 0 [bad]"); 11731da177e4SLinus Torvalds return 0; 1174ec26815aSDavid Howells } 11751da177e4SLinus Torvalds 11761da177e4SLinus Torvalds /* 11771da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 11781da177e4SLinus Torvalds * sleep) 11791da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 11801da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 11811da177e4SLinus Torvalds */ 1182fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 11831da177e4SLinus Torvalds { 1184a455589fSAl Viro _enter("%pd", dentry); 11851da177e4SLinus Torvalds 11861da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 11871da177e4SLinus Torvalds goto zap; 11881da177e4SLinus Torvalds 11892b0143b5SDavid Howells if (d_really_is_positive(dentry) && 11902b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 11912b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 11921da177e4SLinus Torvalds goto zap; 11931da177e4SLinus Torvalds 11941da177e4SLinus Torvalds _leave(" = 0 [keep]"); 11951da177e4SLinus Torvalds return 0; 11961da177e4SLinus Torvalds 11971da177e4SLinus Torvalds zap: 11981da177e4SLinus Torvalds _leave(" = 1 [zap]"); 11991da177e4SLinus Torvalds return 1; 1200ec26815aSDavid Howells } 1201260a9803SDavid Howells 1202260a9803SDavid Howells /* 120379ddbfa5SDavid Howells * Clean up sillyrename files on dentry removal. 120479ddbfa5SDavid Howells */ 120579ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode) 120679ddbfa5SDavid Howells { 120779ddbfa5SDavid Howells if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 120879ddbfa5SDavid Howells afs_silly_iput(dentry, inode); 120979ddbfa5SDavid Howells iput(inode); 121079ddbfa5SDavid Howells } 121179ddbfa5SDavid Howells 121279ddbfa5SDavid Howells /* 1213260a9803SDavid Howells * handle dentry release 1214260a9803SDavid Howells */ 121566c7e1d3SDavid Howells void afs_d_release(struct dentry *dentry) 1216260a9803SDavid Howells { 1217a455589fSAl Viro _enter("%pd", dentry); 1218260a9803SDavid Howells } 1219260a9803SDavid Howells 1220260a9803SDavid Howells /* 1221d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1222d2ddc776SDavid Howells */ 1223d2ddc776SDavid Howells static void afs_vnode_new_inode(struct afs_fs_cursor *fc, 1224d2ddc776SDavid Howells struct dentry *new_dentry, 1225b8359153SDavid Howells struct afs_iget_data *new_data, 1226a58823acSDavid Howells struct afs_status_cb *new_scb) 1227d2ddc776SDavid Howells { 12285a813276SDavid Howells struct afs_vnode *vnode; 1229d2ddc776SDavid Howells struct inode *inode; 1230d2ddc776SDavid Howells 1231d2ddc776SDavid Howells if (fc->ac.error < 0) 1232d2ddc776SDavid Howells return; 1233d2ddc776SDavid Howells 1234d2ddc776SDavid Howells inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, 1235b8359153SDavid Howells new_data, new_scb, fc->cbi, fc->vnode); 1236d2ddc776SDavid Howells if (IS_ERR(inode)) { 1237d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1238d2ddc776SDavid Howells * the new directory on the server. 1239d2ddc776SDavid Howells */ 1240d2ddc776SDavid Howells fc->ac.error = PTR_ERR(inode); 1241d2ddc776SDavid Howells return; 1242d2ddc776SDavid Howells } 1243d2ddc776SDavid Howells 12445a813276SDavid Howells vnode = AFS_FS_I(inode); 12455a813276SDavid Howells set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); 1246a58823acSDavid Howells if (fc->ac.error == 0) 1247a58823acSDavid Howells afs_cache_permit(vnode, fc->key, vnode->cb_break, new_scb); 124873116df7SDavid Howells d_instantiate(new_dentry, inode); 1249d2ddc776SDavid Howells } 1250d2ddc776SDavid Howells 1251b8359153SDavid Howells static void afs_prep_for_new_inode(struct afs_fs_cursor *fc, 1252b8359153SDavid Howells struct afs_iget_data *iget_data) 1253b8359153SDavid Howells { 1254b8359153SDavid Howells iget_data->volume = fc->vnode->volume; 1255b8359153SDavid Howells iget_data->cb_v_break = fc->vnode->volume->cb_v_break; 1256b8359153SDavid Howells iget_data->cb_s_break = fc->cbi->server->cb_s_break; 1257b8359153SDavid Howells } 1258b8359153SDavid Howells 1259d2ddc776SDavid Howells /* 12609dd0b82eSDavid Howells * Note that a dentry got changed. We need to set d_fsdata to the data version 12619dd0b82eSDavid Howells * number derived from the result of the operation. It doesn't matter if 12629dd0b82eSDavid Howells * d_fsdata goes backwards as we'll just revalidate. 12639dd0b82eSDavid Howells */ 12649dd0b82eSDavid Howells static void afs_update_dentry_version(struct afs_fs_cursor *fc, 12659dd0b82eSDavid Howells struct dentry *dentry, 12669dd0b82eSDavid Howells struct afs_status_cb *scb) 12679dd0b82eSDavid Howells { 12689dd0b82eSDavid Howells if (fc->ac.error == 0) 12699dd0b82eSDavid Howells dentry->d_fsdata = 12709dd0b82eSDavid Howells (void *)(unsigned long)scb->status.data_version; 12719dd0b82eSDavid Howells } 12729dd0b82eSDavid Howells 12739dd0b82eSDavid Howells /* 1274260a9803SDavid Howells * create a directory on an AFS filesystem 1275260a9803SDavid Howells */ 127618bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1277260a9803SDavid Howells { 1278b8359153SDavid Howells struct afs_iget_data iget_data; 1279a58823acSDavid Howells struct afs_status_cb *scb; 1280d2ddc776SDavid Howells struct afs_fs_cursor fc; 1281d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1282260a9803SDavid Howells struct key *key; 12832105c282SDavid Howells afs_dataversion_t data_version; 1284260a9803SDavid Howells int ret; 1285260a9803SDavid Howells 1286d2ddc776SDavid Howells mode |= S_IFDIR; 1287260a9803SDavid Howells 12883b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1289a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1290260a9803SDavid Howells 1291a58823acSDavid Howells ret = -ENOMEM; 1292a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1293a58823acSDavid Howells if (!scb) 1294a58823acSDavid Howells goto error; 1295a58823acSDavid Howells 1296260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1297260a9803SDavid Howells if (IS_ERR(key)) { 1298260a9803SDavid Howells ret = PTR_ERR(key); 1299a58823acSDavid Howells goto error_scb; 1300260a9803SDavid Howells } 1301260a9803SDavid Howells 1302d2ddc776SDavid Howells ret = -ERESTARTSYS; 130320b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 13042105c282SDavid Howells data_version = dvnode->status.data_version + 1; 1305a58823acSDavid Howells 1306d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 130768251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1308b8359153SDavid Howells afs_prep_for_new_inode(&fc, &iget_data); 1309a58823acSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, 1310b8359153SDavid Howells &scb[0], &iget_data.fid, &scb[1]); 1311d2ddc776SDavid Howells } 1312d2ddc776SDavid Howells 1313a58823acSDavid Howells afs_check_for_remote_deletion(&fc, dvnode); 1314a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1315a58823acSDavid Howells &data_version, &scb[0]); 13169dd0b82eSDavid Howells afs_update_dentry_version(&fc, dentry, &scb[0]); 1317b8359153SDavid Howells afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]); 1318d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1319260a9803SDavid Howells if (ret < 0) 1320d2ddc776SDavid Howells goto error_key; 13214433b691SDavid Howells } else { 13224433b691SDavid Howells goto error_key; 1323260a9803SDavid Howells } 1324260a9803SDavid Howells 13252105c282SDavid Howells if (ret == 0) { 13262105c282SDavid Howells down_write(&dvnode->validate_lock); 13272105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 13282105c282SDavid Howells dvnode->status.data_version == data_version) 1329b8359153SDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid, 133063a4681fSDavid Howells afs_edit_dir_for_create); 13312105c282SDavid Howells up_write(&dvnode->validate_lock); 13322105c282SDavid Howells } 133363a4681fSDavid Howells 1334260a9803SDavid Howells key_put(key); 1335a58823acSDavid Howells kfree(scb); 1336260a9803SDavid Howells _leave(" = 0"); 1337260a9803SDavid Howells return 0; 1338260a9803SDavid Howells 1339d2ddc776SDavid Howells error_key: 1340260a9803SDavid Howells key_put(key); 1341a58823acSDavid Howells error_scb: 1342a58823acSDavid Howells kfree(scb); 1343260a9803SDavid Howells error: 1344260a9803SDavid Howells d_drop(dentry); 1345260a9803SDavid Howells _leave(" = %d", ret); 1346260a9803SDavid Howells return ret; 1347260a9803SDavid Howells } 1348260a9803SDavid Howells 1349260a9803SDavid Howells /* 1350d2ddc776SDavid Howells * Remove a subdir from a directory. 1351260a9803SDavid Howells */ 1352d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1353260a9803SDavid Howells { 13542b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1355d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1356d2ddc776SDavid Howells 1357260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1358260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1359c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 136063a4681fSDavid Howells clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1361260a9803SDavid Howells } 1362260a9803SDavid Howells } 1363260a9803SDavid Howells 1364260a9803SDavid Howells /* 1365d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1366260a9803SDavid Howells */ 1367d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1368260a9803SDavid Howells { 1369a58823acSDavid Howells struct afs_status_cb *scb; 1370d2ddc776SDavid Howells struct afs_fs_cursor fc; 1371f58db83fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1372260a9803SDavid Howells struct key *key; 13732105c282SDavid Howells afs_dataversion_t data_version; 1374260a9803SDavid Howells int ret; 1375260a9803SDavid Howells 13763b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1377a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1378260a9803SDavid Howells 1379a58823acSDavid Howells scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL); 1380a58823acSDavid Howells if (!scb) 1381a58823acSDavid Howells return -ENOMEM; 1382a58823acSDavid Howells 1383260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1384260a9803SDavid Howells if (IS_ERR(key)) { 1385260a9803SDavid Howells ret = PTR_ERR(key); 1386260a9803SDavid Howells goto error; 1387260a9803SDavid Howells } 1388260a9803SDavid Howells 1389f58db83fSDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1390f58db83fSDavid Howells if (d_really_is_positive(dentry)) { 1391f58db83fSDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1392f58db83fSDavid Howells ret = afs_validate(vnode, key); 1393f58db83fSDavid Howells if (ret < 0) 1394f58db83fSDavid Howells goto error_key; 1395f58db83fSDavid Howells } 1396f58db83fSDavid Howells 139779ddbfa5SDavid Howells if (vnode) { 139879ddbfa5SDavid Howells ret = down_write_killable(&vnode->rmdir_lock); 139979ddbfa5SDavid Howells if (ret < 0) 140079ddbfa5SDavid Howells goto error_key; 140179ddbfa5SDavid Howells } 140279ddbfa5SDavid Howells 1403d2ddc776SDavid Howells ret = -ERESTARTSYS; 140420b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 14052105c282SDavid Howells data_version = dvnode->status.data_version + 1; 1406a58823acSDavid Howells 1407d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 140868251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1409a58823acSDavid Howells afs_fs_remove(&fc, vnode, dentry->d_name.name, true, scb); 1410260a9803SDavid Howells } 1411260a9803SDavid Howells 1412a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1413a58823acSDavid Howells &data_version, scb); 14149dd0b82eSDavid Howells afs_update_dentry_version(&fc, dentry, scb); 1415d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 141663a4681fSDavid Howells if (ret == 0) { 1417d2ddc776SDavid Howells afs_dir_remove_subdir(dentry); 14182105c282SDavid Howells down_write(&dvnode->validate_lock); 14192105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 14202105c282SDavid Howells dvnode->status.data_version == data_version) 142163a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 142263a4681fSDavid Howells afs_edit_dir_for_rmdir); 14232105c282SDavid Howells up_write(&dvnode->validate_lock); 142463a4681fSDavid Howells } 1425260a9803SDavid Howells } 1426260a9803SDavid Howells 142779ddbfa5SDavid Howells if (vnode) 142879ddbfa5SDavid Howells up_write(&vnode->rmdir_lock); 1429f58db83fSDavid Howells error_key: 1430260a9803SDavid Howells key_put(key); 1431d2ddc776SDavid Howells error: 1432a58823acSDavid Howells kfree(scb); 1433d2ddc776SDavid Howells return ret; 1434d2ddc776SDavid Howells } 1435260a9803SDavid Howells 1436d2ddc776SDavid Howells /* 1437d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1438d2ddc776SDavid Howells * 1439d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1440d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1441d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1442d2ddc776SDavid Howells * 1443d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1444d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1445d2ddc776SDavid Howells */ 1446a38a7558SDavid Howells static int afs_dir_remove_link(struct afs_vnode *dvnode, struct dentry *dentry, 1447a38a7558SDavid Howells struct key *key) 1448d2ddc776SDavid Howells { 1449d2ddc776SDavid Howells int ret = 0; 1450d2ddc776SDavid Howells 1451d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1452d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1453d2ddc776SDavid Howells 145430062bd1SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 145530062bd1SDavid Howells /* Already done */ 1456a38a7558SDavid Howells } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 1457a38a7558SDavid Howells write_seqlock(&vnode->cb_lock); 1458440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1459440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1460440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1461051d2525SDavid Howells __afs_break_callback(vnode, afs_cb_break_for_unlink); 1462440fbc3aSDavid Howells } 1463a38a7558SDavid Howells write_sequnlock(&vnode->cb_lock); 1464440fbc3aSDavid Howells ret = 0; 1465440fbc3aSDavid Howells } else { 1466051d2525SDavid Howells afs_break_callback(vnode, afs_cb_break_for_unlink); 1467440fbc3aSDavid Howells 1468d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1469d2ddc776SDavid Howells kdebug("AFS_VNODE_DELETED"); 1470d2ddc776SDavid Howells 1471d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1472d2ddc776SDavid Howells if (ret == -ESTALE) 1473d2ddc776SDavid Howells ret = 0; 1474440fbc3aSDavid Howells } 1475d2ddc776SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 1476d2ddc776SDavid Howells } 1477d2ddc776SDavid Howells 1478d2ddc776SDavid Howells return ret; 1479d2ddc776SDavid Howells } 1480d2ddc776SDavid Howells 1481d2ddc776SDavid Howells /* 1482d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1483d2ddc776SDavid Howells */ 1484d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1485d2ddc776SDavid Howells { 1486d2ddc776SDavid Howells struct afs_fs_cursor fc; 1487a58823acSDavid Howells struct afs_status_cb *scb; 1488fa59f52fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1489fa59f52fSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1490d2ddc776SDavid Howells struct key *key; 149179ddbfa5SDavid Howells bool need_rehash = false; 1492d2ddc776SDavid Howells int ret; 1493d2ddc776SDavid Howells 14943b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1495d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1496d2ddc776SDavid Howells 1497d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1498d2ddc776SDavid Howells return -ENAMETOOLONG; 1499d2ddc776SDavid Howells 1500a58823acSDavid Howells ret = -ENOMEM; 1501a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1502a58823acSDavid Howells if (!scb) 1503a58823acSDavid Howells goto error; 1504a58823acSDavid Howells 1505d2ddc776SDavid Howells key = afs_request_key(dvnode->volume->cell); 1506d2ddc776SDavid Howells if (IS_ERR(key)) { 1507d2ddc776SDavid Howells ret = PTR_ERR(key); 1508a58823acSDavid Howells goto error_scb; 1509d2ddc776SDavid Howells } 1510d2ddc776SDavid Howells 1511d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1512d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1513d2ddc776SDavid Howells if (ret < 0) 1514d2ddc776SDavid Howells goto error_key; 1515d2ddc776SDavid Howells 151679ddbfa5SDavid Howells spin_lock(&dentry->d_lock); 1517fa59f52fSDavid Howells if (d_count(dentry) > 1) { 151879ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 151979ddbfa5SDavid Howells /* Start asynchronous writeout of the inode */ 152079ddbfa5SDavid Howells write_inode_now(d_inode(dentry), 0); 152179ddbfa5SDavid Howells ret = afs_sillyrename(dvnode, vnode, dentry, key); 152279ddbfa5SDavid Howells goto error_key; 152379ddbfa5SDavid Howells } 152479ddbfa5SDavid Howells if (!d_unhashed(dentry)) { 152579ddbfa5SDavid Howells /* Prevent a race with RCU lookup. */ 152679ddbfa5SDavid Howells __d_drop(dentry); 152779ddbfa5SDavid Howells need_rehash = true; 152879ddbfa5SDavid Howells } 152979ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 153079ddbfa5SDavid Howells 1531d2ddc776SDavid Howells ret = -ERESTARTSYS; 153220b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1533a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1534a38a7558SDavid Howells afs_dataversion_t data_version_2 = vnode->status.data_version; 1535a58823acSDavid Howells 1536d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 153768251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1538a38a7558SDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); 153930062bd1SDavid Howells 154030062bd1SDavid Howells if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) && 154130062bd1SDavid Howells !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) { 154230062bd1SDavid Howells yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name, 1543a58823acSDavid Howells &scb[0], &scb[1]); 154430062bd1SDavid Howells if (fc.ac.error != -ECONNABORTED || 154530062bd1SDavid Howells fc.ac.abort_code != RXGEN_OPCODE) 154630062bd1SDavid Howells continue; 154730062bd1SDavid Howells set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags); 154830062bd1SDavid Howells } 154930062bd1SDavid Howells 1550a58823acSDavid Howells afs_fs_remove(&fc, vnode, dentry->d_name.name, false, &scb[0]); 1551d2ddc776SDavid Howells } 1552d2ddc776SDavid Howells 1553a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1554a58823acSDavid Howells &data_version, &scb[0]); 1555a38a7558SDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2, 1556a38a7558SDavid Howells &data_version_2, &scb[1]); 15579dd0b82eSDavid Howells afs_update_dentry_version(&fc, dentry, &scb[0]); 1558d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1559a38a7558SDavid Howells if (ret == 0 && !(scb[1].have_status || scb[1].have_error)) 1560a38a7558SDavid Howells ret = afs_dir_remove_link(dvnode, dentry, key); 15612105c282SDavid Howells 15622105c282SDavid Howells if (ret == 0) { 15632105c282SDavid Howells down_write(&dvnode->validate_lock); 15642105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 15652105c282SDavid Howells dvnode->status.data_version == data_version) 156663a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 156763a4681fSDavid Howells afs_edit_dir_for_unlink); 15682105c282SDavid Howells up_write(&dvnode->validate_lock); 15692105c282SDavid Howells } 1570d2ddc776SDavid Howells } 1571d2ddc776SDavid Howells 157279ddbfa5SDavid Howells if (need_rehash && ret < 0 && ret != -ENOENT) 157379ddbfa5SDavid Howells d_rehash(dentry); 157479ddbfa5SDavid Howells 1575d2ddc776SDavid Howells error_key: 1576260a9803SDavid Howells key_put(key); 1577a58823acSDavid Howells error_scb: 1578a58823acSDavid Howells kfree(scb); 1579260a9803SDavid Howells error: 1580260a9803SDavid Howells _leave(" = %d", ret); 1581260a9803SDavid Howells return ret; 1582260a9803SDavid Howells } 1583260a9803SDavid Howells 1584260a9803SDavid Howells /* 1585260a9803SDavid Howells * create a regular file on an AFS filesystem 1586260a9803SDavid Howells */ 15874acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 1588ebfc3b49SAl Viro bool excl) 1589260a9803SDavid Howells { 1590b8359153SDavid Howells struct afs_iget_data iget_data; 1591d2ddc776SDavid Howells struct afs_fs_cursor fc; 1592a58823acSDavid Howells struct afs_status_cb *scb; 159343dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1594260a9803SDavid Howells struct key *key; 15952105c282SDavid Howells afs_dataversion_t data_version; 1596260a9803SDavid Howells int ret; 1597260a9803SDavid Howells 1598d2ddc776SDavid Howells mode |= S_IFREG; 1599260a9803SDavid Howells 16003b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho,", 1601a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1602260a9803SDavid Howells 1603d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1604d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1605d2ddc776SDavid Howells goto error; 1606d2ddc776SDavid Howells 1607260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1608260a9803SDavid Howells if (IS_ERR(key)) { 1609260a9803SDavid Howells ret = PTR_ERR(key); 1610260a9803SDavid Howells goto error; 1611260a9803SDavid Howells } 1612260a9803SDavid Howells 1613a58823acSDavid Howells ret = -ENOMEM; 1614a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1615a58823acSDavid Howells if (!scb) 1616a58823acSDavid Howells goto error_scb; 1617a58823acSDavid Howells 1618d2ddc776SDavid Howells ret = -ERESTARTSYS; 161920b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 16202105c282SDavid Howells data_version = dvnode->status.data_version + 1; 1621a58823acSDavid Howells 1622d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 162368251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1624b8359153SDavid Howells afs_prep_for_new_inode(&fc, &iget_data); 1625a58823acSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, 1626b8359153SDavid Howells &scb[0], &iget_data.fid, &scb[1]); 1627d2ddc776SDavid Howells } 1628d2ddc776SDavid Howells 1629a58823acSDavid Howells afs_check_for_remote_deletion(&fc, dvnode); 1630a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1631a58823acSDavid Howells &data_version, &scb[0]); 16329dd0b82eSDavid Howells afs_update_dentry_version(&fc, dentry, &scb[0]); 1633b8359153SDavid Howells afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]); 1634d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1635260a9803SDavid Howells if (ret < 0) 1636d2ddc776SDavid Howells goto error_key; 16374433b691SDavid Howells } else { 16384433b691SDavid Howells goto error_key; 1639260a9803SDavid Howells } 1640260a9803SDavid Howells 16412105c282SDavid Howells down_write(&dvnode->validate_lock); 16422105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 16432105c282SDavid Howells dvnode->status.data_version == data_version) 1644b8359153SDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid, 164563a4681fSDavid Howells afs_edit_dir_for_create); 16462105c282SDavid Howells up_write(&dvnode->validate_lock); 164763a4681fSDavid Howells 1648a58823acSDavid Howells kfree(scb); 1649260a9803SDavid Howells key_put(key); 1650260a9803SDavid Howells _leave(" = 0"); 1651260a9803SDavid Howells return 0; 1652260a9803SDavid Howells 1653a58823acSDavid Howells error_scb: 1654a58823acSDavid Howells kfree(scb); 1655d2ddc776SDavid Howells error_key: 1656260a9803SDavid Howells key_put(key); 1657260a9803SDavid Howells error: 1658260a9803SDavid Howells d_drop(dentry); 1659260a9803SDavid Howells _leave(" = %d", ret); 1660260a9803SDavid Howells return ret; 1661260a9803SDavid Howells } 1662260a9803SDavid Howells 1663260a9803SDavid Howells /* 1664260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1665260a9803SDavid Howells */ 1666260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1667260a9803SDavid Howells struct dentry *dentry) 1668260a9803SDavid Howells { 1669d2ddc776SDavid Howells struct afs_fs_cursor fc; 1670a58823acSDavid Howells struct afs_status_cb *scb; 1671a58823acSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1672a58823acSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(from)); 1673260a9803SDavid Howells struct key *key; 16742105c282SDavid Howells afs_dataversion_t data_version; 1675260a9803SDavid Howells int ret; 1676260a9803SDavid Howells 16773b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%pd}", 1678260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1679260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1680a455589fSAl Viro dentry); 1681260a9803SDavid Howells 1682d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1683d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1684d2ddc776SDavid Howells goto error; 1685d2ddc776SDavid Howells 1686a58823acSDavid Howells ret = -ENOMEM; 1687a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1688a58823acSDavid Howells if (!scb) 1689a58823acSDavid Howells goto error; 1690a58823acSDavid Howells 1691260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1692260a9803SDavid Howells if (IS_ERR(key)) { 1693260a9803SDavid Howells ret = PTR_ERR(key); 1694a58823acSDavid Howells goto error_scb; 1695260a9803SDavid Howells } 1696260a9803SDavid Howells 1697d2ddc776SDavid Howells ret = -ERESTARTSYS; 169820b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 16992105c282SDavid Howells data_version = dvnode->status.data_version + 1; 1700a58823acSDavid Howells 1701d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { 1702d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1703bc1527dcSDavid Howells goto error_key; 1704d2ddc776SDavid Howells } 1705260a9803SDavid Howells 1706d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 170768251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 170868251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); 1709a58823acSDavid Howells afs_fs_link(&fc, vnode, dentry->d_name.name, 1710a58823acSDavid Howells &scb[0], &scb[1]); 1711d2ddc776SDavid Howells } 1712d2ddc776SDavid Howells 1713a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1714a58823acSDavid Howells &data_version, &scb[0]); 1715a58823acSDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2, 1716a58823acSDavid Howells NULL, &scb[1]); 17177de9c6eeSAl Viro ihold(&vnode->vfs_inode); 17189dd0b82eSDavid Howells afs_update_dentry_version(&fc, dentry, &scb[0]); 1719260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1720d2ddc776SDavid Howells 1721d2ddc776SDavid Howells mutex_unlock(&vnode->io_lock); 1722d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1723d2ddc776SDavid Howells if (ret < 0) 1724d2ddc776SDavid Howells goto error_key; 17254433b691SDavid Howells } else { 17264433b691SDavid Howells goto error_key; 1727d2ddc776SDavid Howells } 1728d2ddc776SDavid Howells 17292105c282SDavid Howells down_write(&dvnode->validate_lock); 17302105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 17312105c282SDavid Howells dvnode->status.data_version == data_version) 173263a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, 173363a4681fSDavid Howells afs_edit_dir_for_link); 17342105c282SDavid Howells up_write(&dvnode->validate_lock); 173563a4681fSDavid Howells 1736260a9803SDavid Howells key_put(key); 1737a58823acSDavid Howells kfree(scb); 1738260a9803SDavid Howells _leave(" = 0"); 1739260a9803SDavid Howells return 0; 1740260a9803SDavid Howells 1741d2ddc776SDavid Howells error_key: 1742260a9803SDavid Howells key_put(key); 1743a58823acSDavid Howells error_scb: 1744a58823acSDavid Howells kfree(scb); 1745260a9803SDavid Howells error: 1746260a9803SDavid Howells d_drop(dentry); 1747260a9803SDavid Howells _leave(" = %d", ret); 1748260a9803SDavid Howells return ret; 1749260a9803SDavid Howells } 1750260a9803SDavid Howells 1751260a9803SDavid Howells /* 1752260a9803SDavid Howells * create a symlink in an AFS filesystem 1753260a9803SDavid Howells */ 1754260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1755260a9803SDavid Howells const char *content) 1756260a9803SDavid Howells { 1757b8359153SDavid Howells struct afs_iget_data iget_data; 1758d2ddc776SDavid Howells struct afs_fs_cursor fc; 1759a58823acSDavid Howells struct afs_status_cb *scb; 1760d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1761260a9803SDavid Howells struct key *key; 17622105c282SDavid Howells afs_dataversion_t data_version; 1763260a9803SDavid Howells int ret; 1764260a9803SDavid Howells 17653b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%s", 1766a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1767260a9803SDavid Howells content); 1768260a9803SDavid Howells 1769d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1770d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1771d2ddc776SDavid Howells goto error; 1772d2ddc776SDavid Howells 1773260a9803SDavid Howells ret = -EINVAL; 177445222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1775260a9803SDavid Howells goto error; 1776260a9803SDavid Howells 1777a58823acSDavid Howells ret = -ENOMEM; 1778a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1779a58823acSDavid Howells if (!scb) 1780a58823acSDavid Howells goto error; 1781a58823acSDavid Howells 1782260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1783260a9803SDavid Howells if (IS_ERR(key)) { 1784260a9803SDavid Howells ret = PTR_ERR(key); 1785a58823acSDavid Howells goto error_scb; 1786260a9803SDavid Howells } 1787260a9803SDavid Howells 1788d2ddc776SDavid Howells ret = -ERESTARTSYS; 178920b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 17902105c282SDavid Howells data_version = dvnode->status.data_version + 1; 1791a58823acSDavid Howells 1792d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 179368251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1794b8359153SDavid Howells afs_prep_for_new_inode(&fc, &iget_data); 1795a58823acSDavid Howells afs_fs_symlink(&fc, dentry->d_name.name, content, 1796b8359153SDavid Howells &scb[0], &iget_data.fid, &scb[1]); 1797d2ddc776SDavid Howells } 1798d2ddc776SDavid Howells 1799a58823acSDavid Howells afs_check_for_remote_deletion(&fc, dvnode); 1800a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1801a58823acSDavid Howells &data_version, &scb[0]); 18029dd0b82eSDavid Howells afs_update_dentry_version(&fc, dentry, &scb[0]); 1803b8359153SDavid Howells afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]); 1804d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1805260a9803SDavid Howells if (ret < 0) 1806d2ddc776SDavid Howells goto error_key; 18074433b691SDavid Howells } else { 18084433b691SDavid Howells goto error_key; 1809260a9803SDavid Howells } 1810260a9803SDavid Howells 18112105c282SDavid Howells down_write(&dvnode->validate_lock); 18122105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 18132105c282SDavid Howells dvnode->status.data_version == data_version) 1814b8359153SDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid, 181563a4681fSDavid Howells afs_edit_dir_for_symlink); 18162105c282SDavid Howells up_write(&dvnode->validate_lock); 181763a4681fSDavid Howells 1818260a9803SDavid Howells key_put(key); 1819a58823acSDavid Howells kfree(scb); 1820260a9803SDavid Howells _leave(" = 0"); 1821260a9803SDavid Howells return 0; 1822260a9803SDavid Howells 1823d2ddc776SDavid Howells error_key: 1824260a9803SDavid Howells key_put(key); 1825a58823acSDavid Howells error_scb: 1826a58823acSDavid Howells kfree(scb); 1827260a9803SDavid Howells error: 1828260a9803SDavid Howells d_drop(dentry); 1829260a9803SDavid Howells _leave(" = %d", ret); 1830260a9803SDavid Howells return ret; 1831260a9803SDavid Howells } 1832260a9803SDavid Howells 1833260a9803SDavid Howells /* 1834260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1835260a9803SDavid Howells */ 1836260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 18371cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 18381cd66c93SMiklos Szeredi unsigned int flags) 1839260a9803SDavid Howells { 1840d2ddc776SDavid Howells struct afs_fs_cursor fc; 1841a58823acSDavid Howells struct afs_status_cb *scb; 1842260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 184379ddbfa5SDavid Howells struct dentry *tmp = NULL, *rehash = NULL; 184479ddbfa5SDavid Howells struct inode *new_inode; 1845260a9803SDavid Howells struct key *key; 18462105c282SDavid Howells afs_dataversion_t orig_data_version; 18472105c282SDavid Howells afs_dataversion_t new_data_version; 184863a4681fSDavid Howells bool new_negative = d_is_negative(new_dentry); 1849260a9803SDavid Howells int ret; 1850260a9803SDavid Howells 18511cd66c93SMiklos Szeredi if (flags) 18521cd66c93SMiklos Szeredi return -EINVAL; 18531cd66c93SMiklos Szeredi 185479ddbfa5SDavid Howells /* Don't allow silly-rename files be moved around. */ 185579ddbfa5SDavid Howells if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) 185679ddbfa5SDavid Howells return -EINVAL; 185779ddbfa5SDavid Howells 18582b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1859260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1860260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1861260a9803SDavid Howells 18623b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", 1863260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1864260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1865260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1866a455589fSAl Viro new_dentry); 1867260a9803SDavid Howells 1868a58823acSDavid Howells ret = -ENOMEM; 1869a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1870a58823acSDavid Howells if (!scb) 1871a58823acSDavid Howells goto error; 1872a58823acSDavid Howells 1873260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1874260a9803SDavid Howells if (IS_ERR(key)) { 1875260a9803SDavid Howells ret = PTR_ERR(key); 1876a58823acSDavid Howells goto error_scb; 1877260a9803SDavid Howells } 1878260a9803SDavid Howells 187979ddbfa5SDavid Howells /* For non-directories, check whether the target is busy and if so, 188079ddbfa5SDavid Howells * make a copy of the dentry and then do a silly-rename. If the 188179ddbfa5SDavid Howells * silly-rename succeeds, the copied dentry is hashed and becomes the 188279ddbfa5SDavid Howells * new target. 188379ddbfa5SDavid Howells */ 188479ddbfa5SDavid Howells if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { 188579ddbfa5SDavid Howells /* To prevent any new references to the target during the 188679ddbfa5SDavid Howells * rename, we unhash the dentry in advance. 188779ddbfa5SDavid Howells */ 188879ddbfa5SDavid Howells if (!d_unhashed(new_dentry)) { 188979ddbfa5SDavid Howells d_drop(new_dentry); 189079ddbfa5SDavid Howells rehash = new_dentry; 189179ddbfa5SDavid Howells } 189279ddbfa5SDavid Howells 189379ddbfa5SDavid Howells if (d_count(new_dentry) > 2) { 189479ddbfa5SDavid Howells /* copy the target dentry's name */ 189579ddbfa5SDavid Howells ret = -ENOMEM; 189679ddbfa5SDavid Howells tmp = d_alloc(new_dentry->d_parent, 189779ddbfa5SDavid Howells &new_dentry->d_name); 189879ddbfa5SDavid Howells if (!tmp) 189979ddbfa5SDavid Howells goto error_rehash; 190079ddbfa5SDavid Howells 190179ddbfa5SDavid Howells ret = afs_sillyrename(new_dvnode, 190279ddbfa5SDavid Howells AFS_FS_I(d_inode(new_dentry)), 190379ddbfa5SDavid Howells new_dentry, key); 190479ddbfa5SDavid Howells if (ret) 190579ddbfa5SDavid Howells goto error_rehash; 190679ddbfa5SDavid Howells 190779ddbfa5SDavid Howells new_dentry = tmp; 190879ddbfa5SDavid Howells rehash = NULL; 190979ddbfa5SDavid Howells new_negative = true; 191079ddbfa5SDavid Howells } 191179ddbfa5SDavid Howells } 191279ddbfa5SDavid Howells 19139dd0b82eSDavid Howells /* This bit is potentially nasty as there's a potential race with 19149dd0b82eSDavid Howells * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry 19159dd0b82eSDavid Howells * to reflect it's new parent's new data_version after the op, but 19169dd0b82eSDavid Howells * d_revalidate may see old_dentry between the op having taken place 19179dd0b82eSDavid Howells * and the version being updated. 19189dd0b82eSDavid Howells * 19199dd0b82eSDavid Howells * So drop the old_dentry for now to make other threads go through 19209dd0b82eSDavid Howells * lookup instead - which we hold a lock against. 19219dd0b82eSDavid Howells */ 19229dd0b82eSDavid Howells d_drop(old_dentry); 19239dd0b82eSDavid Howells 1924d2ddc776SDavid Howells ret = -ERESTARTSYS; 192520b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, orig_dvnode, key, true)) { 1926a58823acSDavid Howells orig_data_version = orig_dvnode->status.data_version + 1; 1927a58823acSDavid Howells 1928d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) { 1929d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { 1930d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 19319dd0b82eSDavid Howells goto error_rehash_old; 1932d2ddc776SDavid Howells } 193337c0bbb3SDavid Howells new_data_version = new_dvnode->status.data_version + 1; 1934a58823acSDavid Howells } else { 1935a58823acSDavid Howells new_data_version = orig_data_version; 1936d2ddc776SDavid Howells } 1937a58823acSDavid Howells 1938d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 193968251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode); 194068251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode); 1941d2ddc776SDavid Howells afs_fs_rename(&fc, old_dentry->d_name.name, 194263a4681fSDavid Howells new_dvnode, new_dentry->d_name.name, 1943b98f0ec9SDavid Howells &scb[0], &scb[1]); 1944d2ddc776SDavid Howells } 1945d2ddc776SDavid Howells 1946a58823acSDavid Howells afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break, 1947a58823acSDavid Howells &orig_data_version, &scb[0]); 1948a58823acSDavid Howells if (new_dvnode != orig_dvnode) { 1949a58823acSDavid Howells afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2, 1950a58823acSDavid Howells &new_data_version, &scb[1]); 1951d2ddc776SDavid Howells mutex_unlock(&new_dvnode->io_lock); 1952a58823acSDavid Howells } 1953d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1954260a9803SDavid Howells if (ret < 0) 19559dd0b82eSDavid Howells goto error_rehash_old; 1956d2ddc776SDavid Howells } 1957d2ddc776SDavid Howells 195863a4681fSDavid Howells if (ret == 0) { 195979ddbfa5SDavid Howells if (rehash) 196079ddbfa5SDavid Howells d_rehash(rehash); 19612105c282SDavid Howells down_write(&orig_dvnode->validate_lock); 19622105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) && 19632105c282SDavid Howells orig_dvnode->status.data_version == orig_data_version) 196463a4681fSDavid Howells afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 196579ddbfa5SDavid Howells afs_edit_dir_for_rename_0); 19662105c282SDavid Howells if (orig_dvnode != new_dvnode) { 19672105c282SDavid Howells up_write(&orig_dvnode->validate_lock); 196863a4681fSDavid Howells 19692105c282SDavid Howells down_write(&new_dvnode->validate_lock); 19702105c282SDavid Howells } 19712105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) && 19722105c282SDavid Howells orig_dvnode->status.data_version == new_data_version) { 19732105c282SDavid Howells if (!new_negative) 197463a4681fSDavid Howells afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 197579ddbfa5SDavid Howells afs_edit_dir_for_rename_1); 197663a4681fSDavid Howells 197763a4681fSDavid Howells afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 197879ddbfa5SDavid Howells &vnode->fid, afs_edit_dir_for_rename_2); 19792105c282SDavid Howells } 198079ddbfa5SDavid Howells 198179ddbfa5SDavid Howells new_inode = d_inode(new_dentry); 198279ddbfa5SDavid Howells if (new_inode) { 198379ddbfa5SDavid Howells spin_lock(&new_inode->i_lock); 198479ddbfa5SDavid Howells if (new_inode->i_nlink > 0) 198579ddbfa5SDavid Howells drop_nlink(new_inode); 198679ddbfa5SDavid Howells spin_unlock(&new_inode->i_lock); 198779ddbfa5SDavid Howells } 19889dd0b82eSDavid Howells 19899dd0b82eSDavid Howells /* Now we can update d_fsdata on the dentries to reflect their 19909dd0b82eSDavid Howells * new parent's data_version. 19919dd0b82eSDavid Howells * 19929dd0b82eSDavid Howells * Note that if we ever implement RENAME_EXCHANGE, we'll have 19939dd0b82eSDavid Howells * to update both dentries with opposing dir versions. 19949dd0b82eSDavid Howells */ 19959dd0b82eSDavid Howells afs_update_dentry_version(&fc, old_dentry, &scb[1]); 19969dd0b82eSDavid Howells afs_update_dentry_version(&fc, new_dentry, &scb[1]); 199779ddbfa5SDavid Howells d_move(old_dentry, new_dentry); 19982105c282SDavid Howells up_write(&new_dvnode->validate_lock); 199979ddbfa5SDavid Howells goto error_tmp; 200063a4681fSDavid Howells } 200163a4681fSDavid Howells 20029dd0b82eSDavid Howells error_rehash_old: 20039dd0b82eSDavid Howells d_rehash(new_dentry); 200479ddbfa5SDavid Howells error_rehash: 200579ddbfa5SDavid Howells if (rehash) 200679ddbfa5SDavid Howells d_rehash(rehash); 200779ddbfa5SDavid Howells error_tmp: 200879ddbfa5SDavid Howells if (tmp) 200979ddbfa5SDavid Howells dput(tmp); 2010260a9803SDavid Howells key_put(key); 2011a58823acSDavid Howells error_scb: 2012a58823acSDavid Howells kfree(scb); 2013260a9803SDavid Howells error: 2014260a9803SDavid Howells _leave(" = %d", ret); 2015260a9803SDavid Howells return ret; 2016260a9803SDavid Howells } 2017f3ddee8dSDavid Howells 2018f3ddee8dSDavid Howells /* 2019f3ddee8dSDavid Howells * Release a directory page and clean up its private state if it's not busy 2020f3ddee8dSDavid Howells * - return true if the page can now be released, false if not 2021f3ddee8dSDavid Howells */ 2022f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) 2023f3ddee8dSDavid Howells { 2024f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 2025f3ddee8dSDavid Howells 20263b6492dfSDavid Howells _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); 2027f3ddee8dSDavid Howells 2028f3ddee8dSDavid Howells set_page_private(page, 0); 2029f3ddee8dSDavid Howells ClearPagePrivate(page); 2030f3ddee8dSDavid Howells 2031f3ddee8dSDavid Howells /* The directory will need reloading. */ 2032f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 2033f3ddee8dSDavid Howells afs_stat_v(dvnode, n_relpg); 2034f3ddee8dSDavid Howells return 1; 2035f3ddee8dSDavid Howells } 2036f3ddee8dSDavid Howells 2037f3ddee8dSDavid Howells /* 2038f3ddee8dSDavid Howells * invalidate part or all of a page 2039f3ddee8dSDavid Howells * - release a page and clean up its private data if offset is 0 (indicating 2040f3ddee8dSDavid Howells * the entire page) 2041f3ddee8dSDavid Howells */ 2042f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 2043f3ddee8dSDavid Howells unsigned int length) 2044f3ddee8dSDavid Howells { 2045f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 2046f3ddee8dSDavid Howells 2047f3ddee8dSDavid Howells _enter("{%lu},%u,%u", page->index, offset, length); 2048f3ddee8dSDavid Howells 2049f3ddee8dSDavid Howells BUG_ON(!PageLocked(page)); 2050f3ddee8dSDavid Howells 2051f3ddee8dSDavid Howells /* The directory will need reloading. */ 2052f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 2053f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 2054f3ddee8dSDavid Howells 2055f3ddee8dSDavid Howells /* we clean up only if the entire page is being invalidated */ 2056f3ddee8dSDavid Howells if (offset == 0 && length == PAGE_SIZE) { 2057f3ddee8dSDavid Howells set_page_private(page, 0); 2058f3ddee8dSDavid Howells ClearPagePrivate(page); 2059f3ddee8dSDavid Howells } 2060f3ddee8dSDavid Howells } 2061